Light and sound are very different. Sound is actually a mechanical disturbance through air or another medium. Sound always needs a medium to travel through, and the type of medium determines its speed ...

Faster-than-light (FTL) travel is a concept that has long captivated both the scientific community and science fiction enthusiasts. In a cosmos where light speed is viewed as the ultimate velocity ...

Since Einstein, physicists have found that certain entities can reach superluminal (that means "faster-than-light") speeds and still follow the cosmic rules laid down by special relativity.